. >> thank you >> woodruff: russian president vladimir putin today told german chancellor angela merkel that ukraine must remove its military from the country's southeastern region to resolve the showdown with pro-russian militants. this comes after the acting ukrainian president said his government's security forces had lost control of the area. james mates of independent television news reports from donetsk. >> reporter: they must have guessed what was coming. in a rare show of resistance, well-equipped, but clearly nervous, riot police decide to take a stand as a pro-russia may day march approaches. and in moments, it starts. sheer weight of numbers, driving the police back. first, they release some tear gas, but much too close to their own lines to be effective. then come stun grenades, thrown repeatedly into the crowd. it drove them back all right, but incited even greater fury. the police position was becoming completely untenable. they were forced back inside the building. this is the last official building, the last government office in donetsk that was still showing any loyalty